Naming:
Change pressure to size_pressure, it notes correctly that this value is
updated and expected to be used for size updating only.
Change name of cursor function and since it is used for uv sculpting
only now move to the relevant file. Also cleanup unneeded functionality
from function.
Stroke:
Separate updating of stroke variables to invariants (updated when
stroke->init = false) and variants.
5d79c2662e